How many g-atoms and no. of atoms are there in 120 g carbon? 

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No. of g-atoms of Carbon = mass of carbon / at. mass of carbon  = 120/12 = 10

1 g-atom of carbon has no. of atoms = 6.023 x 1023

10 g-atoms of carbon has no. of atoms 10 x 6.023 x 1023 or 10N.

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